How much is #(5x^6 + 9x^3 - 6x) + (-9x^7 - 20x^2 - 6x)#?

1 Answer
Alan P.
Aug 1, 2015

#-9x^7+5x^6+9x^3-20x^2-12x#

Explanation:

Grouping by powers of #x# this could be written as
#color(white)("XXXX")##{: (,,+5x^6,+9x^3,,-6x), (+,-9x^7,,,-20x^2,-6x):}#
#color(white)("XXXX")##"-------------------------------------------------------"#
#color(white)("XXXX")##{: (" ",-9x^7,+5x^6,+9x^3,-20x^2,-12x) :}#

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